Process of producing potassium hydrogen phosphate.



' nnn osrx rns I mmvcaries.

BENJAMIN PEAGOCK, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOB, BY MESNE ASSIGNMENTS, TO, INTERNATIONAL AGRICULTURAL CORPORATION, NEW YORK,

N. Y., A CORPORATION OF NEW YORK.

BROCESS OF PRODUCING POTASSIUM HYDROGEN PHOSPHATE.

Ho Drawing.

Specification of Letters Patent. Application filed April 17, 1912, Serial N0. 691,509.

Patented Dec. 3, 1912.

To all whom it may concern:

Be it known that I, BENJAMIN a citizen of the United States, residing at Philadelphia, inthe county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Processes of Producing Potassium Hydro-.

ess which will be simple, comparatively inexpensive, and expeditious in practice.

With these and other objects in view, the

invention consists in the novel steps constltuting my process as will be more fully hereinafter disclosed pointed out in the claims.

In car ying out my invention, I reduce the feldspar or leucite and the phosphate and particularly rock to a fine state of sub-division, and mix them in such proportions that the calcium oxid in the phosphate rock and the silica and aluminum oxid in the feldspar will be present in the mixture in chemically equivalent prop'ortions,,so that calcium and aluminum silicates will be formed.

For example, I may take 600 pounds of phosphate rock which, under average circumstances, will contain :-1

CaO 306 lbs. SiO 36 A1 0 12 FeO 6 r 0. 192 CO2, etc 48 I And I may take 2,000 pounds of leucite which an average analysis shows will con- I then suitably crush and finely subdivide PnAoocK,

these raw materials and mix 600 pounds of "the phosphate rock material with 2,000

pounds of the leucite material so as to provide full chemical equivalents of A1 0 FeO, Ca() and MgO for all'the SiO present. The mixture then contains 31 5 pounds of CaO, 235 lbs. A1 0,, 129 lbs. MgO, and 6 lbs. FeO, making 735 lbs. of basic oxids to 1110 pounds ofsilica. It also contains 192 pounds of phosphoric anhydrid to 223 pounds of-potassium oxid. I next heat-this I mixture to substantially 1500" C. to efi'ect a complete sintering or fusion of the materials, to decompose the silicates of the leu- -.cite, and to form silicates with the lime,

alumina, magnesium oxid and iron oxid, in accordance w th the following equations 1 oao+sio,=casio,

2 M o+sio =M sio,

(3) FeO+SiO ,=FeSiO 4 A1,O +Si(),=Al,SiO

. In the meantime the potassium o'xid contained-in the feldspar or leucite unites with the phos horic anhydrid in the phosphate rock to orm pyro potassium phosphate, in accordance with the following equation After the above combinations have been formed in the furnace, the red hot materials are discharged therefrom and quenched with water which aids in rendering the potassium phosphate soluble in 'that medium during later operations. is next crushed to say 100 mesh and delivered to a digester of any suitable type such for example, as those employed inthe The cinder It is obvious that those skilled in the art may vary the details of my process without departing from the spirit thereof, and therefore, I do not wish to be limited; to the above disclosureexcept as may be required by the claims.

What I claim is 1. The process of producing a potassium hydrogen phosphate which consists in mixing'in a finely divided condition phosphate rock with a mineral containing an oxid of. potassium in suitable chemical proportionsfor said oxid to unite with-the phosphorus in said rock to form a potassium phosphate and for the other constituents of said minpotassium phosphate more easily soluble in the later operations; treating the quenched materials with steam at a pressure above theatmosphere to form potassium hydro gen phosphate and suitably dissolving out and recovering said latter phosphate, substantially as described.

2. The process of roducing potassium hydrogen phosphate rom phosphate me? and a mineral containing potassium oxi which consists in suitably mixing and proportioning said minerals to permit the formation of potassium pyro phosphate K P O and a plurality of silicates; heating said mixture until a mixture 0 said silicates and said pyrophosphate is formed; and converting said pyro-phosphate into potassium hydrogenphosphate, substan tially as described.

In testimony whereof, I aflix my signature, in presence of two witnesses l BENJAMIN PEACOCK.-

Witnesses:

I. C. MINFORD, L. MILToN Moran. 

